273, or 318?

For the 142, I would be looking at a Volvo 5 cyl turbo. I am not impressed with the eco boost reliability. Manufacturers casting turbo exhaust into the head. I believe it leaves too much heat in the head leading to head gasket and cracking issues. I read Stellantis is working on casting the turbine housing into the head. I can read screwup coming.
Another good fit for the 140 series and 240 series Volvos is the SBF especially with aluminium heads.
he was making the call on it, evidently he got a totalled out mustang on the cheap so that's all going in.

not my first choice, but he's the one with the money.

i told him a coyote motor would be tons of fun, but was adamant about it not being a V8 swap. he has a 60's jag for that anyway.